From Longman Dictionary of Contemporary Englishhave something on your side/something is on your sidehave something on your side/something is on your sideADVANTAGEused to say that you have an advantage that increases your chances of successhave time/luck/God/right etc on your side Barnes didn’t have much experience, but he had youth and enthusiasm on his side. → side
Examples from the Corpus
have time/luck/God/right etc on your side• But they do not always have right on their side.• The Arabs have right on their side, too.• Because female fertility decreases rapidly after the age of 30, they do not have time on their side.• When managers have to make decisions, they have time on their side - and yet are not always right.• After this year's election win, they have time on their side.• You have time on your side. 